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New York Police Department Crime Scene officers investigate the scene of an explosion outside a Starbucks coffee shop May 25, 2009 at the intersection of 92nd Street and Third Avenue on Manhattan's Upper East Side in New York. The explosion happened about 3:30 EDT and damaged windows and a chair but there were no injuries.

NEW YORK — An explosion shattered the windows of a Starbucks coffee shop in New York City, but no injuries were reported.

Police were trying to determine what type of device caused the blast early Monday morning at the intersection of 92nd Street and Third Avenue on Manhattan's Upper East Side, New York Police Department Lt. Mike Wyosokowski said.

The explosion occurred at around 3:30 a.m., when the coffee shop was closed.

Seven people were evacuated from the building above the store, but all returned home, a Police Commissioner Kelly told NBC affiliate WNBC.

There was “no message, no note, no advanced phone call,” he said, adding that the blast was caused by a “low order improvised device.”

Police swept the area but no other devices were found and the area seemed safe, WNBC reported.

The city has experienced other predawn explosions in recent years at the British and Mexican consulates and at a military recruiting station in Times Square.